Cut pastry sheet in half. Repackage and refrigerate one half for another use. On a lightly floured surface, roll out remaining half into an 8-in. circle. Transfer to a 7-in. pie plate; flute edges.
Line unpricked pastry shell with a double thickness of heavy-duty foil. Bake at 450° for 8 minutes. Remove foil; bake 5 minutes longer. Cool on a wire rack.
In a small bowl, whisk milk and pudding mix for 2 minutes. Let stand for 2 minutes or until soft-set. Sprinkle toffee bits over crust; layer with banana and pudding. Spread with whipped topping. Refrigerate for at least 1 hour before serving. Store leftovers in the refrigerator. Yield: 4 servings.